feat: add documentation for additional security threats and recommendations

docs/issues/Additional_Security.md

@@ -0,0 +1,42 @@
+### Additional Security Threats to Consider
+
+**1. Supply Chain Attacks**
+- **Threat:** Compromised Docker images, npm packages, Go modules
+- **Current Protection:** ❌ None
+- **Recommendation:** Add Trivy scanning (already in CI) + SBOM generation
+
+**2. DNS Hijacking / Cache Poisoning**
+- **Threat:** Attacker redirects DNS queries to malicious servers
+- **Current Protection:** ❌ None (relies on system DNS resolver)
+- **Recommendation:** Document use of encrypted DNS (DoH/DoT) in deployment guide
+
+**3. TLS Downgrade Attacks**
+- **Threat:** Force clients to use weak TLS versions
+- **Current Protection:** ✅ Caddy enforces TLS 1.2+ by default
+- **Recommendation:** Document minimum TLS version in security.md
+
+**4. Certificate Transparency (CT) Log Poisoning**
+- **Threat:** Attacker registers fraudulent certs for your domains
+- **Current Protection:** ❌ None
+- **Recommendation:** Add CT log monitoring (future feature)
+
+**5. Privilege Escalation (Container Escape)**
+- **Threat:** Attacker escapes Docker container to host OS
+- **Current Protection:** ⚠️ Partial (Docker security best practices)
+- **Recommendation:** Document running with least-privilege, read-only root filesystem
+
+**6. Session Hijacking / Cookie Theft**
+- **Threat:** Steal user session tokens via XSS or network sniffing
+- **Current Protection:** ✅ HTTPOnly cookies, Secure flag, SameSite (verify implementation)
+- **Recommendation:** Add CSP (Content Security Policy) headers
+
+**7. Timing Attacks (Cryptographic Side-Channel)**
+- **Threat:** Infer secrets by measuring response times
+- **Current Protection:** ❌ Unknown (need bcrypt timing audit)
+- **Recommendation:** Use constant-time comparison for tokens
+
+**Enterprise-Level Security Gaps:**
+- **Missing:** Security Incident Response Plan (SIRP)
+- **Missing:** Automated security update notifications
+- **Missing:** Multi-factor authentication (MFA) for admin accounts
+- **Missing:** Audit logging for compliance (GDPR, SOC 2)